Island



3 Sheets-Sheet 1. S.'A. BRIGG.

Hot Air Furnace.

Patented July 31, 1855.

3. Sheets-Sheet 2. S. A. BRIGG.

Hot Air Furnace,

No. 13,374. Paterited July 31, 1855.

UNITED STATES PATENT OFFICE.

SAML. N. BRIGGS, OF PROVIDENCE, RHODE ISLAND.

HOT-AIR FURNACE.

Specification of Letters Patent No. 13,374, dated July 31, 1855.

To all whom it may concern Be it known that I, SAMUEL A. BRIGGS, ofProvidence, in the county of Providence and State of Rhode Island, haveinvented a new and useful or Improved Hot-Air Furnace; and I do herebydeclare that the same is fully described and represented in thefollowing specification and the accompanying drawings, letters, figures,and references thereof.

Of these drawings, Figure 1, denotes a front end view of my improvedfurnace as it appears with its external door thrown open; Fig. 2, is aside elevation of its radiator and fire-place. Fig. 3 is a centralvertical, and longitudinal section of it.

In constructing my improved hot air furnace, I extend horizontally froma fire-place or chamber, A, a long radiating or smoke chamber B, and Iplace concentrically or axially within the same, and at some distancefrom it another radiating chamber, C, which I provide at or near thefire place with an induction air pipe D, made to lead from the hot airchamber E, through the bottom of the outer radiator and through thespace F, between the two radiators and into the inner radiator as seenin Fig. 3.

The front end of the inner radiator opens into the hot air chamber or itmay be provided with one or more pipes for conducting hot air to one ormore apartments.

From the smoke space F, between the two radiators, the smoke andvolatile products of combustion may be led by means of one or morepipes, G, leading out of or adjacent to that end of it which is farthestfrom the fire-place-and into other radiators if desirable to have such.

The front end of the inner radiator or drum is closed, as seen at a, andsuch radiator is made to project into the fire chamber and over thegrate so that the flame of the fire may strike against its under surfacein rear of the pipe D. It will also impinge against the end a, whichmakes part of the boundary of the fire or flame chamber of the furnace.

H, is the grate and I, is the ash pit of the furnace. The front part, b,of the fuel space of the said fire place may be made to turn upward onhinges 0, like a common door, and for convenience of removing clinkersor coals from the fire grate. The ash pit and fire place doors are seenat K, and L, those having a chamber M, arranged in front of them and thefire-place and ash pit. This chamber is furnished with a door N, havingone or more air induction orifices 0, 0, 0, made in its lower part.Opening out of the upper part of the chamber M, is apassage R, whichforms acommunication between the chamber M, and the main hot air chamberE. This passage is provided with a damper or hinged cover 8, from whicha crank T, projects downward as seen by dotted lines in Fig. 3, and isjointed to a sliding rod U, which extends horizontally through the doorframe V, and so as to rest against the door N when it is closedthedamper under such circumstances being elevated as seen by dotted linesin Fig. 3.

hen the door N, is opened, the damper by its own weight will fall downand close the passage R. The act of closing the door will press theslide U, inward and raise the damper. All, or a greater portion of theheat radiated from the front of the fire place and ash pit doors intothe chamber in front of them will be absorbed by the current of airpassing up through such chamber and will be carried by such into themain hot air chamber from whence it will be distributed by the air pipesleading therefrom to different apartments to be warmed.

The chamber M, not only serves to save heat, but to prevent itsradiation into the room or apartmentfrom which the door N, separates thechamber M.

The above described air heating apparatus or furnace is very simple inits construction, and efficient in operation. The axis of its main andsecondary radiator being disposed horizontally renders the action of theheat or its absorption by the radiators very great and advantageous. Thecurrent of air proceeding through the inner radiator instead of beingcarried into the main hot air chamber may be led by a pipe directly intoany room to be warmed, while other rooms may be heated from pipesleading out of the top of the main hot air chamber. This insures abetter or more equal distribution of the heated air than when it is alltaken directly from the top of the hot air chamber. This furnacepresents an important advantage in this respect over most if not allothers. The arrangement of the inner radiator with respect to the fireplace and so that the flame and smoke can impinge against one end of it,as well as around its outer surface is important. Projecting the innerradiator in other respects as it not only absorbs heat and radiates itinto the air passing through it but it deflects the flame against theinner radiator and toward its closed end.

I claim The passage R leading from the chamber M, to the hot air chamberE, in combination with the damper S, crank T, and rod U, operated inmanner as described and for. the purpose as specified.

In testimony whereof I have hereunto set my signature this seventeenthday of February, A. D. 1855.

SAMUEL A. BRIGGS.

Witnesses:

E. W. HOWARD, FRANCIS E. HOPPIN.

